Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c1d3eec6cda4c9c7ac7728e4b854bfd6855ee7867dd8735d2ed7bc29c230d0' 
  AND token = 'rKUJg0ewuVAtHhs6HP8SgjfwT2nPGEX9d7zFVxkjdLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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