Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcc0f6681ae959e199bcba29a203f62ea2291c18844a5016798fbfbc1a1ac8d' 
  AND token = '6UDEVoTRG13KNzLgLKcDbWChIEz4IkIScANIc/SDSsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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