Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd38964e565356d11e7af07ecaee226ff13340f9d1358b1b12ece5a058c803c5' 
  AND token = 'FCJrdr/35AOV9ISxaFb6w03LrIL3zLaW7n975kfAziI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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