SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '24f99bfa6eb269d832f8c703d708b199b8091dc07a8b20682b478db01f4509fe' 
  AND token = '+z0BmuHB3DzRkplYP3o1KIhOlBH5WQtl0sUih9snE7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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