Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f1f237130dea28383c9766895642c1ec41c0c697a114d47bc837e2778c1fd2' 
  AND token = '5J9bZ35/cziCqYOpcnsrlr7UI47C/U69MLGY3RMu9p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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