Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de4c327c523d6c3793f18fa99515c2a7652a6563486f8f11647eacab2094ba4' 
  AND token = 'WguSmMgSQFoT1BqNmeChkECtKOyzSwmwwsF4xrExWcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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