Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6b99f0e9b39483e49afbc45e8646a612a91c6fce5d80ffaccefad2473ed42e' 
  AND token = 'FR2OmRvTmQu6vONpq4L3EgSj6UGJN7HcCLod+9o6q4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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