SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '863857a24a7ba963037be71d7862a93ae37258ea4b07619381926b2f7f3e159f' 
  AND token = 'fFptroFxslSZI+dpVEbE/MoQvx5wqhEJodCGFIapGuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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