Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad4dfa99b7236e74fc8e8ba58a3a5e1b675920768e20d1c895fd90b0e750c4f' 
  AND token = '6V5nc/K8JTY3OQbx3gSDqyniyMtCe70uz4pevf7mOMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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