Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848cf7b761ddf9698ff70352ad11e3be69d4203cc1723aa5ebc9c7050b1c246c' 
  AND token = 'k10j197PLuKLfnY8WSqSmqVrTdWaaQyJ5WxXKYZq7yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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