key rack; key hook; wall-mounted key holder
Refers to a small fixture, usually wall-mounted, with hooks or a rack for hanging keys.
I installed a key rack in the entrance.
I hang the car key on the key hook.
Alternate spelling using 掛け; both are used, but 鍵かけ is more common.
Compound of 鍵 (key) and 掛け (hanging), from the verb 掛ける (to hang).