Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f3505f7b4d7ffbd7e6aba551c639f5696cdb1b6bfebeb3f2cc2e43f57b1f28d' 
  AND token = 'rvalcBcPXYJ0MW5FN1Iqc9eHVyYCFOCi4JMAVsqgD34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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