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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c6d3ab9607721555c178039be0ca83c6b09a5128d11789bd2a1a32068fd7b2b8' 
  AND token = 'pufwRLbbeylHWYRTVtFzki6AM3cGB7RV6RcJ3ONefMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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