McDonald's Israel (distinct from McDonald's Corporate) supports Israel in the sense that it pays taxes and is a corporate citizen on the ground.
Beyond that, it has not taken actions that could be classified as "first tier corporate support to the cause of Zionism" (which is simply a classification for donors to a specific organisation anyhow).
For example, Israeli settlers (known for being staunch Zionists) boycotted McDonald's for not opening in West Bank settlements.
Israeli settlers are up in arms about McDonald’s refusal to build an outlet in the West
Bank, calling to boycott the company’s entire operations in Israel. The chain cited a
policy of “staying out of occupied territories” with other businesses joining in.
Additionally, Omri Padan (the owner and general manager of McDonald's Israel) is one of the founders of Peace Now, an Israeli organisation that openly questions the wisdom of settlement strategy.
As Padan told Haaretz in 1998:
McDonald’s-Israel has not nor will it open a branch in any Israeli settlement beyond the Green Line. Back when I was the general manager of Kitan Textiles, I told the board I would resign immediately if they moved to open a plant [in] the West Bank. I have the privilege of not needing to compromise on my principles
Further, McDonald's Israel has taken other business decisions that place it at odds with other issues important to Zionists, such as employing Jews on Saturdays, running non-Kosher outlets and more.
So it seems that the Malaysian boycott claims are tenuous at best, and appear to be based on understanding the language used by a community organisation to describe local corporate sponsors as a literal description of larger geopolitical involvement.