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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce90f54c4493a7116c6e85622559f4f4b5b692474504fece91987afa7a90266a' 
  AND token = 'wQv7CeYON/b3prchA4HrRaD4K4MJ+5wuOlkCOWeXBOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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