Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e8e84986d62facc9fb47c246d36e41f08b3baefc2575c6a96f9d8b45496e42' 
  AND token = '59E0prYHn5QSBCI3AO2DfA5fgapVzpx22QLuD2H/8E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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