Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23ffde01bb9975079979a1244a6a8988920addb94bd0d25ed842d1f4f7023e2' 
  AND token = '5Cbw8gUbMcFcQVpJJgUKFuA2gCja/IcJ+KRwSQmnrsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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