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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '512e0271d5b8457401ca0ef607e9c7b04e1262f793d79c1050f62a8e8665396d' 
  AND token = 'DdRZa/WULUJ1rdzlwc1umSb/UoR6zGZeAruZdRRRXYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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