Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4723c007d0fec935ea97a0fbab8e9f444d584c418ceb20ef645cbbb82e38dd4' 
  AND token = 'lnWkNLB5UEs8JsZdgtexsi6BUvohtQ5LWohLiPMyh1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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