Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5905734754f6ddc2f6d5e691b15e139cd9b9a9f56f1b8acc1ac7be219e298e5' 
  AND token = 'hDTVo6QUEWc1pqXnqiMKTzlQ7tWV6uvmehut6i12PZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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