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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '834feefea961eb88d5a84711b6670b9bcf6fac3429940d1f89b72c651798e3d5' 
  AND token = 'ic1h7orqYT6CZuVKKPLsFw2DdtC8kyI32SZb1QyFffo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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