Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1511781d748680af706979bffe11782dc1e0280e090845d70a8b9eef69c73cb' 
  AND token = 'NfyQ8ohueNfQkkMyRwyvz3Co5IdYdkHp0+rhtJKoiDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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