Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '278e006b9ff6f4738eb2ce928ceb8f06416497972508827034805831c9cbae55' 
  AND token = 'XXKrCxbGMd5w6pnXHq96J5w5E8uYq260PvqmElj0zso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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