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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b1d7c02b71dd7fd7925115e8d11db0cf35068621134202d95ca41800557086a3' 
  AND token = 'dqFzOnBl+wtLuAok1X02z5YFcpNCc34LyHt/o2u4QQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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