Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbac5223aa26aeed13ae4e2837671a2c3fc7deabd5e5ca582b326bca5b564447' 
  AND token = 'cuhbXBtZOT0ZRIz29qx5nZuIlwlWu5z5bAtAXXk+EA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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