Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caaef27b4a46761e7cc02923d3d0a5e8ea5b32aa999b25d95de994dcdac48ae0' 
  AND token = 'Yn7XdKJ/2gFxKnHT+7uh0LRmYHA9fklOB82jTjY01Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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