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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '600559a9f67198226815994763c159182e302be18635ffc091be761e729d8462' 
  AND token = 'OgN0pGTWO7Nt7ORdWTdk/n2W5t2JV7Ze/tLD4Z7GxXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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