Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '50a88b0b3f0da93fa95d7d5933da29d02adbfccbeef93301c3885c681c3fc0e8' 
  AND token = 'Ju7SfUsky9fSyEUS16av1I8n8+WtZ6qZkZOxe+58r74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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