Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1e5d9ea0792f9c97e33fc177185dbd8842320ad16595120a0586e4f59c229a' 
  AND token = 'MIokE+Rb/ckGXmb6QLhxRkhQNqynddFcGUzYm6p6N5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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