Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6caaf2dfbff64d8e5a4b60372bc093b9a1a9e8949be93d8a6df5e62eb49071c' 
  AND token = '/8EWZDohsUGaVeoZiAiqMwGIDPWnQdJa9OTaG4sGO4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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