Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8deb19c150fe0583353ee9f8aaef57fa5b648f1805203da8e43905ded194e3a' 
  AND token = 'MZZvE6VsqE8ZDLUEe7UWm30aQdWugCardzvxu5xoGRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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