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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '96af12a2aebb6afcf8e01eb90c53c6566dced3bc43ab1278d399e19065dab79f' 
  AND token = '9oA2RRf7teJX+8MOfpnAprI0QEm6HBnRjY0iJncGvF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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