Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b65c138ccfd2006fc051d82d5fc358552c732209279ab12401c849075c2e24e' 
  AND token = 'BSmt2/v6PMaj0ryJQ/8m6XZ0voAvBfW+xQWIMbWxsTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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