Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc9268d8dd06f47f1c9bf5e584198d17a665306cc07a3b2f0a535da3fb9fb34' 
  AND token = 'xAoRyY7ancEN8b6g+BtMB07L5ZUzYMsg/foEjjsAZws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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