Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b1b95a242972805d1d9e2e423546c3e7be257074fd0a278550574b71bcb046' 
  AND token = 'qxjrwV18aVZ+rhEqJAeUJd2eVSKxIp2Dkbb9Ky6IoMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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