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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '94357ff210cfbbe1ed3fbfcf374ecae33efb203ee68f332d81a2bb0db16b604d' 
  AND token = '/2fDUwn7jA4+FohWuwDQA6DK2QOKdbnu6bH9tGM4k7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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