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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1aa213564eb1e898406e865a5d059ae063545ca2c4fe890b8fe61005acec8a5d' 
  AND token = 'qDux72eWYLisM8gQn/ZspPuEU1qMMS22wspx/VDVHF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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