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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '699abb9bb1866cbe1a41a802aa7cec43612d58b60a9cd3f130f4b864f7d095fe' 
  AND token = 'RiKnexGjGZGMolTuhFGQRifE/tq/7tPeQspF6ppeV8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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