Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c511bd1dd0b51d1d892b88fb226eba8eb8418c74b0f93ad6ed0daad1ab1c3c' 
  AND token = 'RLrux/P+vgigjiu4yZPlqEiqLnlBHZDXg7eVUCqnXno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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