Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7701875f01901277e5050b45764a0f2e37b27ba1c0ec8c744ca09d0626bf7df6' 
  AND token = 'ECKMKeusxH1/3YMNVKqAkKryI7dPomnemNXllrq9XxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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