Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd757d513d96515ba5ed3dd23bc24b828bc384a6c2c61a955a0823076da8c9ed3' 
  AND token = 'ZzNKSZOOBbuPqI5OZglTUcyZa5/JHWhSlh5IGvBjTSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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