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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '19de243f9972e40c37fcd9adba8505b3f81ff6e2590a19feed71cbb400b66dca' 
  AND token = 'we6cV2xvY98xnUhBuUGwdNQfDbRaQOHXr2WapK99/Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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