Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af34c3fa1bfe242fe083eb2d028d5bda962c7077291b43040efbb4a7801b59b1' 
  AND token = 'Bj2HnhM4bJbkaeFI1UHPlJkpNG8MZBRsl3uvjth8FOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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