Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca1da9c162e964401e171c53dbbe3fa3c6513b7754c78b77c4a33e1841ae9c7' 
  AND token = '5i9HPitBwEFEBRXLt9vaT5cuFZ5Ufdfsn/8M5P7PcDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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