Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ae955972706db588fcd1dbe78e32f65ecab62aec398bcb720271ed7c439f7e9' 
  AND token = '19psRyUyAIqPzkWZoqClUL9Xox2g8ExiksU5Nfa+ULM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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