Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '521dbaedaae8f16a8f2284177dd877c630d1b32e45d000338b1d3673fe2e2a7d' 
  AND token = 'xmuEnCaTgM4umDiQ1qjhG3lwyZYyo95EDH7/mF7yvHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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