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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd88d0a39c8013942361488dfe3a65961f4151131e4f5daae44531b2006e9286d' 
  AND token = 'IwM7o22VXBYTeEN3vHw0397tq5jvA+E+NA4Dg551w2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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