SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b9fca091434afaade40ed853a2cd1a4a9d5b62fca9924797d507161ccb77dd51' 
  AND token = 'AKwqK970k4qCjSkfJyG18+7M6s4Zaq2YIhJg8+DSMg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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