Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9e14bf9c3fded735a399ca69462bb21abb212bd9ce29faaad1e84cd370fbac' 
  AND token = 'VJisCsD4oLcJOFaSSFxgp1uxzjVc0ZCMrITA2G9GUgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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