Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea80ae5d5c8b7aafab078014896ddbb60e1e686406094af62dff0c883db04ca8' 
  AND token = 'Nx975BUfnEzi+f+ZMgbDzLeMwunXMi6cbekAgqcYp4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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