Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4e7ba41e8724a91407f8ab9f473bec8ba1d26903c9ce816473d4d4d83dd51f' 
  AND token = '7OfIRuZr8/rA69LKFAbdM7BvK6F/jycYYnqlj6nK4MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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