Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb740c0052fbf822d01095e7f6dd21e9169dd2e2b6d76e7c21a657a04ebe3a54' 
  AND token = 'eYuyd4rjP/QqK8FANnt9spIBsjreh+uUT/5yHPRMmr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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