Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795be00d3e0e12a2181866711eca81ad04f138e1a7b03be386715e1ec139d3e7' 
  AND token = 'UTtah3yPgIgefSRLGcIsfHAY51HqriPB/56Djf4qCzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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