Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116ad080206acf29a10e2816e31df3e5707ebdcc9651e3be3a92194cbcca49c9' 
  AND token = 'RlkFMQlOW1ulDZCRLJan1S7/wJiJwX2+tI/dVpt0d3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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