Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a521597ff7575a8c8e4505e8e62491d24633cb3fb0eab0aa7aa50e4e07b97af' 
  AND token = 'dxj1QpN4GbGZsVwdmgEYKwOdqyobHWm3K8ksdFEqNoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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