SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b56773336ae076e840a6da3e968e47b59d82d9b0398c92ac8d6243f6db2f040' 
  AND token = 'qjtHiOChp+wo/QSfjxedyIunUjYR/OfpkivsZZbC5AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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