Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb23bb5993a398917209c5ce293dab4c814118adaa773c6fe9a666e3a272138c' 
  AND token = 'mVxx5U6DOXHWf19RyuzOStpZBNMG6e/SCmKoMVpeHAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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