Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a749bb2b1d717bee5e7ba9cd3572b843b693ca2115587e5dfd5f4e6b41217cd8' 
  AND token = 'ydLGCvGwHSEjBkeRu1c/qe7za31ybp3MQdLIvOLMcbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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