Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf7d311b858a135e8d2de2781eb5152196900cd71f3e4eca7c2a0a485ded556' 
  AND token = 'WgfTvn66BHYwEl8dpEVYF6uRWBWaWfP7U7F/H0Z/k0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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