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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '453ba68d3ba245e7220c49a224fb281dd33e5c21bf91d5fb29e8fea4e0997e04' 
  AND token = 'j9mNT1vhyryOnzDQOvwlWilWCAz9YQGOJM4xHwcH7z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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