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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '836cdabf45bf264ec0336fc3e97227865babc13fd619f94e497e7933a8d56726' 
  AND token = '3G1dxE0cblZFujnOB3GdtfNT2LEIwNvau61Zj9h9fKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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