Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476e2e532e99e747e517ff4fc15fd0e3a3185958805a92f8f0a6c90153d1a272' 
  AND token = 'xo/akXDMQaTI/pVhp9vpzFWGIu9Ahkxwg7P01C6Apac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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