Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853678b1451b2973197d6b38f0ade0cbfa100fa3983bf6e8d3990b1c2a6c82e1' 
  AND token = 'EIbMYqeBLzT8zUHKgRidaPQapb1gbCnnDIHnpoo4f0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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