Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c74cee81ea2b3559ada65e1e97a635aef60badc2bc3f06588a5b7dc5842b39a' 
  AND token = 'a9dXyV8+v+SkJKFaj5Nv600SGLAeRLIjADgi4glHs9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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