Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ee3b2af42fcf24540c6cdde8d04dd8aeb922fafb8881332db936da197c8e28' 
  AND token = '+15UhsiMpZUP8yO5rnMvkgvzK7gWkVmqizi9Pi6XFfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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