Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40b1af3fc02ab07fd9df9b151a2db60281620fbac55d009ddad38065bbc76ac' 
  AND token = '82xFlb77+mfxXHDnnqirC0FaAYKFcpM4Dumwit2N0AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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