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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0091882e030fe16e1a27407192421967f410acc55c214437a9da2fdf23a4455c' 
  AND token = 'mtwJL9ikLXNWAi+/9DGRfApT0eQGnpCpOFKFrwGIw64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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