Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e877fec7ae9348f77af9f18cd6e1312e61513bb55dfc842e6679516e936658e9' 
  AND token = 'gci6kOZrL6XPZxscHc2Qs9QVlN+UWA8hLT9bxy6J6SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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