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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9b34fb72f79b3233f90ff75770434ef6d0c7a0afdb2220a9dbc57063066e6a9c' 
  AND token = '0RevyJ99m22iKbEbE6GgIx/0Wpa88MuzBCClSyhapZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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