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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9fc8f6d98704948cf7d3602cfa184f88716ec8d71b719fc57d5957e472ee48b0' 
  AND token = 'o6BVkRfhI6FYJw9xJXsxxRMGrUBAQ7zinVUpq6ff3uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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