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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '21bd228cda63254f78c29738956096a9d41cf7ac326ab065b85a7211a49d896f' 
  AND token = 'YoTiU6gx3t3ewBtVWFFpJMkk0l4pn/iXfHZNdGkaYlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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