Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b86fc5ab685c5cc3aebd459ebef2b1eaec4fbd241456eda6dcf72c998ceb63d' 
  AND token = 'NqI1jsr1YOIvcbz9yLi2DWZuQd2RrMPm8zkthsX5prs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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