Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4a13cfd6a3bf223fed3f9c3e918d81862483e4cadb51a45c7f6b5df3f4e8f5' 
  AND token = 'y/KezcLipoDJcHtlFDDFhEFPSaUdGBNvRrUp8jvamdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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