Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2b7f6cd603b97ccaecd6a6c310f478d0559013d32af854fcdd43d3c35eaf70' 
  AND token = 'yrqbBzlsll4zYrPYcrkAjPNzar694QZIvvjHNEDWIfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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