Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e8b694f260626df979c579c52c683b3fb2e43c17d3677fb45b74cc4d283912' 
  AND token = '2aCy7beOETIBVj+xrklRrxSKEekCaLMdgrrGVefHAUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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