Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f4d44838c2448e9326a570743552add436719e8c712178bce43dcbf6d29c8d' 
  AND token = 'e0iGjV6FcJBGSV5NRki1PnAvULqpaa5SurUTmawjawU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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