Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caad2cb013c1ff2b41670444c74a465a84efcfaeb4a9852d76ea0d5d0d43df72' 
  AND token = 'nRjoh5A224loiMuD14QpcwQB+b0I+qZ6a/sYNdnxE+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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