Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1646b942d9daf4be87a8526450f19b9b2a9ef86cefd340a2c0478807707a08d3' 
  AND token = 'HAFINrxmReiYAOhjdMV0HhgoaY9RtLxlYaqo8nAAVRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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