Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59851a8a0ec32c579c7eeb2e819356e3ba2aae94182910d4d4ab786d513f55c9' 
  AND token = 'c1khGRiJbKiyFUcUQyrtvmmO7bkFQhq87nnWjSv0kwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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