Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2451aefb6e44b452a66cdc393765b3c9cce49b9820ee2a4e70c902d0f9c9a4' 
  AND token = 'drQeQJha3E9ps4pnoC2oQUqfKNPDRtxzWjE9iZ5Cpag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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