Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35495ef85933bd1f32c83b9df4bf40c9c9fee2a7c8ea6fc48fdee0a4bd71b622' 
  AND token = 'cFe6zNiKFgAMLvqaam3WkbnMIAnLJAxPf0+cFnhOoW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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