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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '61806581c1ef946b6444186966ccba4abf1bec68e1d63a9cc657ce7d89ad0b40' 
  AND token = 'uFvqYlhL0UbI566BENdnah0s23xg/ivUwRXq94s54rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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