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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '02fdc481ca595a508e5be8efaf5b62f6946fe193d94d886f99f6b80cb10127ee' 
  AND token = '+50t4N8IveqJVQLMSq9PXWxKcb+L47QIiXa43v4t6hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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