Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138b54318dd4c52cbf994c7ecf36aed9847c7f90aae37e2ac8fbbbee70b7ad24' 
  AND token = '+NM+shMdSGfvm8JfEMWhL1xBqO/0bnsCKivfukIJths=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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