Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f296ed2d7416271dde61959c46174606b0c0bfa77ee091fab8cbaa183953207f' 
  AND token = 't/fXq1px9AquhAX+u3RLF0HiT9ANh13UF8NhzsvkRyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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