Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adef15e0c5c0a5ea49b085ed4ce84618824187331700f5127c15922409168298' 
  AND token = 'NkIn43juzaZAJBxkkZwzWVxQ10mmzLNsmxV6dlnTq68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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