Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ee1c1349e87cb03a247ed57e65f2d4d7c876f1519a860012b1d8fd56edf9c8' 
  AND token = '88npyuYc6FlY14eySeMEWzmxTKIn+ez+xzn4comQUlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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