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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '78a9f58ef582b131883e28d35a43a98dd630da12f0583d7f442c8cf86b803ea8' 
  AND token = 'pY95KRV09Oz+PBnJFgOvEqc952dvC85zP+b7EdxztaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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