SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7459897aaba20bfa41cfddc749e1c9910d206727c2cf7827bf20a50d8fe5ab1f' 
  AND token = 'V1ej/Hxb5LGKHmUCvUSUG3ZNPcfXDUrPbwxWB3qV/r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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