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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dda131e25528ed87a36f29abba5064d6f8cf9a2ac95cc5ddda5f01b7eb0ebb85' 
  AND token = 'qrxY4hBJw9whmt1IQckXM31+zQBA6EhMEQnpGIoT7Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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