Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79d1fa5b6bc9f78cc2376ed7146e54a5f7dbd0030c3dca37beed163d3ce0c1a' 
  AND token = 'M/aFdy1oLKlmJibau0k5WsAcCScW1of6+anKkp/t6rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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