Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30ccf4d8362264e64c3d3d50efbf5068b8a37f2ebd5ff3b0ad4b0fa6bcc4152' 
  AND token = 'Y+DsbvtaLdVznd351M5xviYVJpUG6iWb1dXEs95MykY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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