Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da65dbc6e89cc76a87724a8e108bc1cb0dcc4ae713bc7ad4a0e7167bdd0657d' 
  AND token = '/oBx0feHbu7Za1ilQuYMZsBTbXLfQh8rkMrANdMuwoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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