Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335ac077108100a1f66b442542c3e4bfb9e09897a6452034d78d18d061ed4406' 
  AND token = 'e+JyZ9CJ/mdlMdSpsMV+MjK39eM2kqQ4xJ2/5e0irXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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