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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e780b5f799477caccfcf2334cc309b4fd9970120d15719460410b6d6dd2ab34' 
  AND token = 'LyAEyITw7K/4seyYU/oiKiglRrLKePXLvvcq1m7X5C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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