SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '530133f814175ae7ebb176d8d11a61e58c3f08e309b7428730f0acae5354cfc0' 
  AND token = 'p77rJ6Upfj2PbrgopLgw8NJPZmWUkY+I8hlWjHBMAVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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