Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cff087cf5c64b16991167f1f56d14e70bb158d6503226ded9e94bb28a393383' 
  AND token = 'FQoiuen8ddWNf59UX0340qa1ogujBTppjWQKbA6VD98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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