Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e8b0e5c9e131d782d875c3d6b5ec23a3a888a7efffb4470f22822515d17c88' 
  AND token = 'XfSPUH8tC3ZEhAu5Isdt7kpMQwp3h9QtHYmkLiYlHZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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