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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cf88e65b37acfae4e58173199a1adfcd4f301aeab6c5fec6a5589052e2e2f60b' 
  AND token = 'SJelqkEqE4mQERoZwldFnsd7gHbMwplyT4QslXHhdvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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