Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1ef7ec0b747e016eaf049c93ecd0a83dcc8fa3eab12a43a4a5721bd6ecca6b' 
  AND token = 'm+RsVbi1VrxgZzV9k0uQezVRUAEl2nz6dzitw8L7/kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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