Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a871e83f29bd8b46122f8e855ed1d12563e0a56454a040fa32ad1e21a5629a8' 
  AND token = 'ib193NkHj7FqmS+iDtlVXnJGFx1PxCFT4Jb321skEjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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