/m/:id/keys lists every key ever created on this MCP.
The full key is not here
It never is. Only a SHA-256 hash and the 12-character prefix are stored, so this list can tell you a key exists but not what it is. That is also why keys are named. A column ofmp_live_a1b2… prefixes cannot answer which one is on staging, and revoking the right one becomes a guess.