Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56af8e22c662eb5368b4971b15c802283a00ef4cc84db29fa232dccb8ce7ab6b' 
  AND token = 'MwSiZLVqN+A0avMqPYpWX5T9WEjqcqnaVw5bKIhnE50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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