Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def2871bf80914ab0a2446d01e235660b7b69aef557d7c0522c6182f8f6aa2a0' 
  AND token = 'TIizZSFHGbVxK3oiu8RPsSTfJTHOC1hWqLOWRG8iigA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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