Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f638883ecca37061364e47f45bec51e2efba094cd3b7ad4560c1634be4cad6' 
  AND token = 'DC3ZOPVze+ESzS9Nvt7rFMcWWqi80vIH2T1euQIEkFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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