Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f453b52908186563f014d35d046d47d490d0b4d2aef119641c49a9a71bfd8d' 
  AND token = '+UzF1vcDJ5GI7FZubZCa4B66uR5jZ58zo+I/fWOagJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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