Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a23ed30ceac8a0e35d24cfde2386b6e72e84bca7e7d244d5a9e7a3e25447c30' 
  AND token = 'oPVZ6AQU2tWnj39eVqdYYdR0tFuvOuwrdwPGWX/QPkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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