Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6918464a126848e7f30aefae5c568a3a4c54d44cc2458736a17a92b0563a9d13' 
  AND token = 'D3+6xiy2t/ZOewXMyf+UAkGR4rmNuhtQWn7j3+bbmCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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