Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21657cdd8c0a6a7eb8d964958c367ca7973a7368de80402f7817499ae939dcb' 
  AND token = 'sNsxERVehJqPAPNGN5if5he0OvLPbMt5RbjJK1pwEhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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