Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6e42e46d7bf6f8828381c6e3d905a276d474388f4c6fa4d16c8e0dab784899' 
  AND token = 'Un9q7lBx04MlliV1a00PwS0FGiCo1TkyPWqEohcg2R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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