Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f73beda1041eb6c617005dac3b5f9f608b8bc374f8d131bb39b6289fad1a5c' 
  AND token = 'mktf+umH7F/nrz3v5of8GS9sRJD/ytxYdWQ9B36p9DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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