Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a7b497201f070db3a40f742a8a6792eabd1fde3d8d28e3c07360263be7fafa' 
  AND token = '2mYKH9Ls20+9dWDbjIK808I27tdHI+HvVcuycuA9Nao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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