Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aff0cf7c66814f3904bb634c0e4c81e5c77c3fc32eeaf40fed870631825f136' 
  AND token = 'jHYamRFkHb+0CRJk/CrE6q6SEkbCDz4TXeAL7fQLdF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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