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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '12c3d276d1aea60d8fa1df2bbab3065db2a289a0dfcb0adaaa1f36aa93e597c4' 
  AND token = 'nfOsCPQLJUpI66A8HktEAmc9Fc3O62zQUvYSvseYxH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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