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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5e33e91cbe6b64c07ca3d88d616011ced18954f731cd00b6170b507815efb1f1' 
  AND token = 'lhIK25JL8ew7p5y0VKc7u1i1U8S9KTGytUrnBwVkzhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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