Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0e76b8e66b0ed8e1f2cface68544778cc7e9608001ebf7e13117d3b007a80e' 
  AND token = 'CvbF55f+Vx5VY4zBzAUkTb9mVBHF/KaHfyDW+wrL0kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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