Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8104702301e124f40606f9668fe2f1e9f7f72f36c062029de36a5d9cd70a434d' 
  AND token = 'B+dA5ALFezXvk5uSM/36VeBYApI1s+ODhrFgvdD5XPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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