Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f406b02e6c47c6b5cf0365c63a44d3838ac560229c939fc38b9e6d4ee62ab4' 
  AND token = 'Lvwg32Qwe3dKKHfLxE04U+rqNSrJr3L9fX3oXzsXUNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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