Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54853568f540af805712b15485e5e2c0794e9138c69088d2bbad104d0635341e' 
  AND token = 'iMQS/xbaEQA65+qZpoLrKdoGdZOOgIiDtgvi0wDWG3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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