Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd977ff413dd1b813857d82f01e80b1ee98d1cdfc1ff9bffe0bedbe450ab0ba1' 
  AND token = 'xDIca0FzCi7o4p7hMv0fiF3f5XF0dFLJFgRy+T6GV9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}