Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6f94636c660e1fbd4d1703e55689dad55e3cbbca94c68b14f8343e0db0c7f3' 
  AND token = 'yGHefmwa1HiBxBa4h5fTUzdmYi/8wmcVFCkvUMq+iZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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