Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82bbe4c7ba3845a750e41d3cf6b7ce04dba996e37362ba4d7440a076899a019' 
  AND token = 'LBIF3sw384edtMeO+ttPW1YTSRNyex8PVZEJ6AmQJ5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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