Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd76697c6ef36d0e508fcccc26dccbaa5e8cd0bb2ad9c794ea1ee4ec0604681' 
  AND token = 'SMmWq8CudXvBWnPtNZHelLQcyxEttQ1JRTMp4J3LiJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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