Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de070591289b18c5f73e8f7bd2647c5cd4720e4b50eb1a6428355a0111be0b78' 
  AND token = '2djvfvhla1jJ7w6EilitLtgQX4G7AO7jdiVL5R8ZEuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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