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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0a8d92850aaf6b6c2c58bbcac109b41c2189cfa2391b8e299e2b2173409b183c' 
  AND token = '+xcvxffrzBq1RgQsmGIDm2eH4Ck5iYxQmukcgB8szt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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