Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30e618b4bc3a56f8ba01dba5c4e514c4be49595de20f299db530c8d7775c3023' 
  AND token = 'Z7xwUfwu1Ol7nsKBU0fpFbZoLxXf62RQLQGIt5CzAr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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