Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1da5ef0beaf566aa70dd84a37ee89ee3e93fa90fb0c0530dd8f4e8ebe652762' 
  AND token = 'uMQq6577GU3lLhXi2MwCZfwBJHQycTppxydHQ/GYw4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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