Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3fc2e6b7507dedd65a4b64a48aca2bb578bd9e13347d2a746ef4c07b9d6ab2c5' 
  AND token = 'kShpPvtXkSD7vSqZVBxrSZxTya08gv0+5O4EgQ8eX9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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