Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb0015325e4c9ba9c28f71b78e0c316e43fa9a370a3a0e5e5e64fdc38d2171d' 
  AND token = 'gZ6SnisUtSOpOTVNoHeWWYUmdDUI5JGkZKbqntNiBjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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