Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573b707a5cca0488ea64d14a8b86ccb8486ca8b0aab80a1dabef037a407073bf' 
  AND token = 'XPo7wkjf0yxQBbnVscTsVqHN4YBQdm9Y7S4LrxaUaRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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