Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7f28b3ef00deb1c23a4ce0b16d7b30ca455b24869cac7e5eac5b204ea15c90' 
  AND token = 'eJoTMqoSYlKqmK8BetjalQ4tewj31TknIFcGKw2XqjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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