Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d73c1b671a4d2825ffc7c13bd4af48ed820f203827344890f414e5060f2dad' 
  AND token = 'c47KyfUAjdjUdPBxZwt/stzsPi/XBrdZC6UnpqNb4y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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