Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9ca8c8efb58bfb2a3e8524d4b8b3df34af4ed57a07e6c80ed32a7d84480e20' 
  AND token = 'U3moXRzQnegTdj3ZnFHmnwIQU5Dbn+JDoyAR6lrpfL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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