SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '07e40f662075867eaf3f988d884a27648c6b623d013cb1babd1ef1393a5754eb' 
  AND token = 'qqmcClv8qic67/NthHywzBELKv2gkFE7dUKUGkG+p18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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