Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b221aa58c2d67adce84c7d87464ce2e7bfba95d2bbffc14ed4e66ca21b5c265c' 
  AND token = 'ZwFvtBhaXtDf0aEIISSaYGLjjuLa5jVBQP2b9RGmr4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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