Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48ba2b1c8e512b73fb6cccdece4266dc4c2b31dbc5c9e174ac88b7af15d7551' 
  AND token = 'hWR5WH4nLsb2zn8lHjLTHYlmU21oPadY9mHYwejcLZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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