Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946c76d33ecf049b258eeefd8ea0fe9300cc82fa50a98361152ce4f7b042c656' 
  AND token = 'HufOfBYuulyt0sJWRsA9tQzrMvQFpB8edI3AzPWgAL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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