Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820f4aa4ca625ab956cf284377aff000a6db6f13b1faeb1fe67d34d977ba1647' 
  AND token = 'Y4MDMo4BkKlbtaaYdMv3D4KWNGq4uIqfZ/P9muRuGPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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