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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5e5306e427cab991fcfa1e41d969f5388d2be63d0f098afea49c5474d7ec0c45' 
  AND token = 'lTOk/b3e7kqnnhHVpN4Mt1fJl5/ZSLWJEFJ0JYlhYqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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