Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bbc2ad5d25635f5ceb4c78d80ae6b3cfd4ab209386b1c6a5e8f02f08a61847' 
  AND token = 'TSCOwrUJiV0wbcwdS4wIbS0ra2o+t4fyXkclQnKBGvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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