Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954306f033541dff3df2dcda9c638fdb88845a390f00fd9f364d8b2546e73dfd' 
  AND token = 'Ld+fXwG/1Ul0iumoAcdlGxUuf6LBVQvD6e46n9EMi2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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