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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bb4e6076dbfa6002503b908657f36e81933624c22b9ac679aa04999984d59441' 
  AND token = 'TFwdv65MYfcth6x/LN9d6Maa+EnUmaTxqS6hNEdBQmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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