Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be9a1efaad7f5ee2d3e2607e6f79e1e72fe6eb3fb3ff59b93dabd359107fbba' 
  AND token = 'LyfIzH+eGB/9XcQ7eQCWRl/veS3T7w8t9sUa2j6VNPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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