Да , может нет, почитай инфу на ключе.
Там написано
Can open Treasure Chests between level 21-85 with 100% chance. When a character below level 77 uses it on a treasure chest that is 6 levels higher or more, or when a character above level 78 uses it on a treasure chest that is 5 levels higher or more, the key disappears but the reward cannot be obtained.