Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f268d20dcb8d79b2f3c93c8d1bf64aed547a8c84b6dda238a60120e47a81500' 
  AND token = 'wDjUN+nBwNXlFxK5nKF4SN6ys2XPFHLxVHDOjoB/xTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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