Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1712d4526ee1059812a95f9e89f36fa8425c798a436f4a50e3f9f2ecfc9400' 
  AND token = 'BIVvhd+E1RT4gNhUcpE6E2SgjXPmmT/hSsOSuSneElo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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