Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686306e9810973e8c8faa75d27ef34b3ef1b4fc2701c60ff70c82b0797d20a03' 
  AND token = 'VBtngqret+AAChGtUhukTGEwPSKfkYH6SLf+Rtk883o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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