Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3986dc30593954cc38fdcad6ec4a6c4108b5e2c559ae4b487b66accb64cd77b' 
  AND token = '41CUmo8WhSvJo5bLUGjRh6JBihVH6g3gppkne426mC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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