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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87bd8340fbf71048818b3fbe8ce5791664bf41f7805d87fb692346c54a667a4a' 
  AND token = 'z0ykJ5I4DjXAzarqKlP+EHSdB9uDETwx6pNL43+0efs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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