Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc511b27335e487cfb439499c88d0a94cc59de948fee93bef184284dbd87a75e' 
  AND token = 'SRM70dnMIn4EivoOqtE9u1FecK+v2gOew0HnAY+Eia0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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