Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ded4972d48cface6ab281e6b3e7fcdffebb0b7e40a4d9d1952e579d2e4422c68' 
  AND token = 'JIOC2/J6bqnwoAIxx8+XL0qEgIndoORjiiuc11FkwV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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