Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd06536dbb495f17482bf721cd89751e0727fab4426d870be304a55061d301a' 
  AND token = 'L8QPhem88LiK7np2BLzWd/+XEPJE63s/D5JnAOc9qFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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