Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75bd02b6e62b2bbfc198171f70aff0944fc4291de6c64e23935eedec4c755613' 
  AND token = 'pE+Y10uxkZBraakTx5P8XPHRBygOkFvQeB/9HYNz6PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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