Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39a093645b9fdbc31f9b4a19ceeb16118bac64c2be2035e4d64cb844089e142' 
  AND token = 'HuaWI06/XufStG30DBhIf7+S9moCviLL6SUWSDpMoUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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