Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9f6180b8f9a94e5fddce3c4d888b2a4a2be2ede4e7a694ebb7fb25a6633898' 
  AND token = 'qarSln+KxxPP8IiYpkNYytJ+ttS1Qd/s4SkI/YaI1Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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