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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3b960d920d59bfac33e071e5e9ac05c54ff78ca9b61392c3df20c3ba27e3d8fa' 
  AND token = 'Ard8IP8hy47VsY+q4Qrd5r58XesIxDawz+T7zTT0pYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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