Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f36c1267902a04faa4e3e1465e40975949e987da906f8fc03d03aefeace13c' 
  AND token = 'mJCf1d17PX24t8+1ri1bRugV2fFN2X/P2DUvioqKDYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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