Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581b6c76233b1375a05a6318795f7496a170ccf4c2eaa92a6c1cf68cc46ae2f3' 
  AND token = 'NW2wbQ1zy5ZSDCpqCLIjkJz7RkQ6P8lRzY704imiAbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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