Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10f0ad36ca3fba0ef6125a76f7d1e9bf44225efb4443cb6edb9d901d469dc5f' 
  AND token = 'vEkWES1AhLuN+nZ29XZiwJ11C+tS1WImsH0o/tXRtVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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