Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d76d40efb1d5e060b1d9a25cbb60e61d8c671ceeba9f61a4d0eb62806950d8' 
  AND token = '/fbuIfxE66Z50BSvw4WcrWb/hcx/c+FbZ8f2YwyiI1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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