Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f51ec50daca5183fd373f9bef1f4333b0ba6ebd75a3ef3b4ba80099de26227' 
  AND token = 'PjsCEkty3rhfUJaR1f3x2BR+aCwxytmRB9YHgbcFAIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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