Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee667dde2a68a3666ad8cd31c0d36c20761f4ea5d9b1473c495dbbb1157bb3d7' 
  AND token = 'g/0qVBqQhCi3tNuH2eNYQfdlsxgqexYUXQ4EJ9c5IpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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