Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017ef86013d92f9dded242c823cdceabfbea6d02887f7c3ec9310934a7abd75c' 
  AND token = 'y8K86tmN/Zz8c9/UfU1YwQ44w8xe/9mbM8xCVs0LGHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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