Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f188f59e56a6912fa9de8cd7ff9b75e9ebbc36df61c759440713e5d7a7d20f9f' 
  AND token = 'XhmWnQsfRWkyLu1b0ELe1eGOSSvnVA4gyFxntxISuek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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