Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5187dbc46afafd0203a4a0c12b75767d71a9bd46d94c1fe84c27757d6ca59a' 
  AND token = 'ln1+EnCTZLAh5HEDbxBkp+eVKIGPh984n1c6+kxuPAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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