Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c338da4f321357e9cbbd789c3137392a814b43402192f46b42b453b1f6d5bf' 
  AND token = 'v6rI+BP721dML+9b4DlHs/5MrSH4Ua4Jaa6Wz+Htjcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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