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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '636153fde6ed05f7c27607f48ab341ed0c73c1c23e9bbac486a89f81f1c465bf' 
  AND token = 'U9I8GER9Vvfa7RU1aJWaSNUS1uvgeEFNWx/Mh/hUhQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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