Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1eb0ea08bdfa19ee0368d5f5b7594a252cdf8be9014af9a62c70fa8926c977' 
  AND token = 'aCu+VOSp0ykZj7y14M5BQghAP2bqEjBZRe/ZVUhTO0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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