Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9e4bf41c260fec31a71fdbd7b2535ea89ad48cbcfee40f1a7af19d024346a5' 
  AND token = 'ifXOHHz0BYPvEgH/eDlaUtdfZIu3O9FAWheb/E+wdIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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