The ornamental design for key cover with RFID payment device, as shown and described.
FIG. 1 is a plan view of the RFID payment device used in the key cover;
FIG. 2 is a plan view of the RFID payment device used in the key cover with the device top material removed to expose chip and antenna circuits internal to RFID payment device;
FIG. 3 is a plan view of the key cover with RFID payment device in open position with a key placed in one leaf of the key cover;
FIG. 4 is a perspective view of the key cover with RFID payment device in closed position without a key; and,
FIG. 5 is a perspective view of the key cover with RFID payment device in closed position enclosing a key.