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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3e990e568f7c4f1ccdeb607e631aa4cd3c45939f3cc7f33cce38e0e1738206d1' 
  AND token = 'ypDrg90xFucFl6oId1icoGXc8r28IqRzxtHqjsvjtMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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