Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2804d19847918a5fd8042bfa8e0f279fb99813271df7ed4aa4faf3fd797a5b' 
  AND token = 'XLiBotPpusT1kGuTBqdHoWwaed2URSV1fJug56tSZ2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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