Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7043c7de8a971e542e2d94a22ae600b88b2bd916f2b7135f8fdfa2b93a6a64e8' 
  AND token = 'oor4/WB1iJ8gN1ZYzNb7L8vh1cY9ma2dLM/wbt8WRvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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