Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb6c57fff55320abc8ccbe7cc31203d666d102592dc42e4167f81a987c9b813' 
  AND token = 'p6p8Ba+Kk6TsRIfXr3xTYfWyye3O6Z9E+uGUNcucIEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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