Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829bde1a1b2213602154394ade93a071eb44acf504334e52f7ecf2dadfe40601' 
  AND token = '7JwfUCsVLOsU+S48ZnmZ4TMjSq2qRLqfs1FLjkoglbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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