Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1542f53043f0f4bde6c9bcfc9f537e4477336ca8016715fe030f84c3eb31a46f' 
  AND token = 'BywMkydowXpnji/DDFgG4fm2Z73Gjt2FWNTx0iWFGcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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