SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '900c3787e3060f8bd7cf1969d49118595d018ea9521b5257758d13ba6cdcfb90' 
  AND token = 'veLPxU/6NDvfoQhg4bUPdISl0/jX6wAco7KsyuVqvYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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