Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fdef2bd1b8d654fb1cb63e6515a9da4bb4947c409576bf08f3e56e8cf81da9' 
  AND token = 'CgQboiT2FyXl8LBHdvfnK0NV+uPyl7nb8ZlDaEgCPTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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