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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '613c9a45551a5971ae5b5741ea096fe17da24e2c50db835ece6136d942dfe59b' 
  AND token = 'bpRbXLaGcWATtaUilAZaIr+Bwzoi3+ChEyFyhI4bMQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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