Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66634c3a6f7491d555688ff1d561976a5ba79216ebe755e436cf9d07cc1f1762' 
  AND token = 'JFQjRoQ+AlFrkwp0iydRzm4UXeqQ1HzQrEHM0veApHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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