Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6c37e7f0bb17b5e30068c22d08f9abfe557b0c9c24b3677bd38a2a9f7eb114' 
  AND token = '44Av2sskASbPOBR6nZanq8ibQA+kdr4/DNTqE9Qf4kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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