SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4b5b73733af8b1ca1e9cdc3bfc1c724c7f004dbaba627f9c2551f54fa5cd80e9' 
  AND token = 'lzdwrQqeKoVz+tMZS+8Nu0DRnXJcnhqKF+nWIsxJlC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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