Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935330e861afb60d92ead78b4c387dff94b046c819bd514bf009c85925d8021e' 
  AND token = 'XeH+RQcq0+f3VXkVJCltoVPtokhhZRXzFDcLMhurvA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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