Where is the key to the door on basement 1 in the sand temple on spirit tracks?

In "The Legend of Zelda: Spirit Tracks," the key to the door on Basement 1 of the Sand Temple is located in a chest that you can find after defeating the enemies in the room. Specifically, you'll need to use the Whirlwind to clear the sand and access the chest. Once you have the key, you can unlock the door and proceed further into the temple.