Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd97df4f945852764f71e5b24bd6c46457199aa0793dcd59b7acc99c0e1d06f6' 
  AND token = 'DBkF6CFXRcF+Mmr2Cbn5uYtHQAUUUPpzS9CgunFPI6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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