Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e40ed5ba4bc19639c32ffdc95a0e75a7f46a68aa7f7e35e4b92a00770b6afc' 
  AND token = 'BLnGmygvYryzP+T1ze1nD9hNfpuNf1MI6/7xKpbg8eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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