Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'abebdd809a8b050e72631e128d0fa98bc71917af79e237c5b917416de7ab87bf' 
  AND token = '0v93GoQAiONE9RW+QVWMlUlCUxaNhWmDLmG2TogH96A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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