Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1126d9dd0f8ff616488be806195115e91d613c1cf1409d5aa3edf18a26831610' 
  AND token = '3JFhSSzgek5xo+rlrOKLmhSkYDEcdJwhf8w05MXfqYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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