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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '333c893303f091ea83f273cb877135eb5af7839adb1b816a43a6de6f79ebcf18' 
  AND token = 'tO2iCMW+PXQ9AhFFXPpZ1IxpQtVWFQM0m/Kp5TbTfo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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