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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '23d12d8a67f300b9b88224114bed77ca6393f61234a810ba7767d777ad97a0ea' 
  AND token = 'EuT5bRo/nyPYdHWIzrpXoYJhCVfasaXWVpSiG39Jm/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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