Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34be79dec0ef74a469efe625266b5ceaa3e16fe8a8239d1fc126730f63212186' 
  AND token = '5M1S6xrI3mu8dUE/kz677WrdUDMpIc78LeYd7SoBIgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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