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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '86a9078953c74921ec22a53d5e74496109a353cc55d9df7166e6e9ae89129d52' 
  AND token = 'sGP0Otqd2cb2Y74y8QByjoaAPSExFkViWf6lBPnJ5PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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