Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d19def4729cb999f872211f0f8b264b3056412eab644dd36b4f0385be435d44' 
  AND token = 'bR/OJNzRpiETyz2Gdg8Z2R45/sKZddzZmHIQNbmjmak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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