Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981328d60f5f8dc8d1de342379c97e3d236e9c3a04a9da2f67a16bf8abb19414' 
  AND token = 'b57s2viu1hws1jtkRxYj8wklpRdX+yNS0cRIfssmhLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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