Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374ae6cc98653baa2bbf7155f700e55cdfa320baaf4f7ee42e9a3ab45aadd390' 
  AND token = 'wnkuV2jqKzvkQ1VfcPUpb7wcQc7dnS3NhF6jvtmtrx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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