Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3871e7a06c1f2bf27fa1c1a67038f56089c6eebe2cd9946b4a3522cbf30bf6fa' 
  AND token = 'Nijl8TfwrmAqHFcJ7/dga4dvDYE6ianXxtAL9a/sbeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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