Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4724320ecac91ac9febd22f7c297703736925838ce02a3d54aebdc849780d6b' 
  AND token = 'PNzdgQ56noXOvvA+bOKY/9eMm1wCpaWrtRhea8llcUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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