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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '47953d7d58e17cbba9b8d512ce11a32f1fc132e79aa279510d465741a559d6c4' 
  AND token = 'kU27LiT4Yu4kVr6a3KZNSY9HnwV4GJQC8n5XRRdv2sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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