Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a05c4bd48615f517ec7bb0b100ed0863e21f3ca4c79eefc7e93f8309a5e25d' 
  AND token = 'a2lMzZusI3gugu9+h49KAIBQnvLA1nmvf1aENlF6Ex8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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