Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a6f3005ed2b5c14c63572d3a17f4b920d966dfe69b6892ab947f9e897e58d2' 
  AND token = 'mpD3ZCQuh/vcQ9oxtDeVsfiSWjpC/rmc1g/2T4EwdsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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