Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3baf8cddcfb8f109e6ab25cc6e5796e786290693b41a70f4ca374e71b1aff36d' 
  AND token = 'W32As/gzYq7qYdxsndSzeXOjAYmAGZdMzmK3jtm2JyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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