Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ccea9cf767a63effceeb8d56255f4d2521379079124f44bcb9738fa3917ef8f' 
  AND token = 'MmAvs2mIdnT7jAEQk4+uypsdVZCEFCWTggVoyWSpysA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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