Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c9e937de9d8c80fee5c68325b050c6f8f7ed6cd05fe209316243c29aa04e9e' 
  AND token = 'ISDSrkBrdcMkxXUqjqxp8aUgU24QFh/yGg8PtIthv+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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