Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd474a7238d9964cd3cfe0b30a1fa885206f1c994cf5a0eaa42635c76b3fa888e' 
  AND token = '3/NUFckFBiiyoEzRYcItRCRAVpZVEjj9ACsdygO9H68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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