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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1be82b7bc3d801ca66908ece5246e291375a971729cf79796fdefc0764616602' 
  AND token = 'pwUSOO5/m0ugPQyISLeBRERBWabQq0d8jznkPrs4I+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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