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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '323e5aadfbc0de2653332cc75d6e8028c5b8a4d72640517b930d383511b8d8dd' 
  AND token = 'SVa6drppb0fQs6+B+bbtOJKV0qJRdr9e5Kmb5tY7oOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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