Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1eb26d7f0e903d08cbd5665244d8d227815682d4fc32fffaa5b353f7765be1' 
  AND token = '8d1TaZpZuW+Ki8HS3hiyc5jO2kO45lRkdSgmKkrgVQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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