Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b7509f36e5937f1420aef012c7e1947caec8950d5ffd4391ae39368d08b66a' 
  AND token = '1MQCpywXMWrbFSuT6I7NVFv3VAdrSlkUN39qCav1j+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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