SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a463a8b53e9ddaaba82399d2a261754a0ca19fa66cfba6ce03521389ee7765d' 
  AND token = 's7i8RAyIsUCkuSoe/YJBpau81LPgwwfuh4JjsVwK/fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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